From: Carlos Alberto Trujillo Jimenez (carlos.trujillo.jimenez@gmail.com)
Date: Wed Mar 12 2008 - 10:27:00 ARST
Mike.
for the following:
"When he says I need Default route + No specific routes + Redistribution
happening but we don't need these re-distributed routes can I use:
area 1 stub no-summary or I have to use area 1 nssa no-summary
no-redistibution and why?"
First, you you are comparing a NSS area and a STUB area, I assume you know
the difference of a stub versus a NSS area right?? (the first permits
external prefies within the NSS area as TYPE 7, the second does not permit
externas prefixes at all within the stub area), so I
The use of both command options depends whether you are using a STUB versus
a NSS area, and where you are doing the redistribution?? in the ABR (ASBR
ALSO) router or in a router from the backbone or other area connected to the
backbone (not the stub or nss area).
For a Stub AREA (THE ABR IS DOING REDISTRIBUTION)
Default route + No specific routes
ABR ROUTER:
router ospf 1
area 1 stub no-summary
Thus the routers within the stub area only installs a default route (blocked
type 3 and 5 lsas)
For a NSS AREA (THE ABR IS DOING REDISTRIBUTION)
Default route + No specific routes + Redistribution
router ospf 1
area 1 nssa no-summary
The routers within the nss area only installs a default route as well as the
redistributed prefixes from the ABR now ASBR ALSO.
For a NSS AREA (THE ABR IS DOING REDISTRIBUTION)
Default route + No specific routes + NO Redistribution
router ospf 1
area 1 nssa no-summary no-redistribution
The routers within the nss area only installs a default route. Now the
prefixes redistributed from the NSS ABR ROUTER DESSAPEAR from the link state
database.
If you are doing the redist in the ABR (ALSO ASBR) Connected to the backbone
and connected to the STUB AREA, those routes are redistributed
2008/3/12, Mike Haddad <mike.haddad@hotmail.com>:
>
> Hello,
>
> Please if anybody can clarify the below:
>
> When he says in the question I need Default route + No specific routes
> + and
> there is no Redistribution happening I can use
> area 1 stub no-summary
> OR
> area 1 nssa no-summary -> Preferred
>
> Right?
>
> When he says I need Default route + No specific routes + Redistribution
> happening but we don't need these re-distributed routes can I use:
> area 1 stub no-summary or I have to use area 1 nssa no-summary
> no-redistibution and why?
>
> Area 1 stub no-summary will provide the requested results, Default route
> will
> be generated, LSA 3,4,5 will be removed no redistribution is allowed.
>
>
> Thanks in advance,
>
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